Spatiotemporal antialiasing in photoacoustic computed tomography

Full-ring ultrasonic transducer array is widely used in photoacoustic computed tomography (PACT) due to its high inplane resolution and full-view fidelity. Image in PACT is often contaminated by spatial aliasing, which has not been studied in detail for full-ring geometry. In this research, using spatiotemporal analysis, we clarified the sources of spatial aliasing. Based this clarification, we demonstrated that the combination of spatial interpolation and temporal filtering can effectively mitigate artifacts caused by aliasing in image reconstruction and spatial sampling. We validated our theory using numerical simulations and in vivo experiments.